CN107070237B - Converter circuit with bidirectional synchronous rectification and dead-zone self-regulation - Google Patents
Converter circuit with bidirectional synchronous rectification and dead-zone self-regulation Download PDFInfo
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- CN107070237B CN107070237B CN201710228080.XA CN201710228080A CN107070237B CN 107070237 B CN107070237 B CN 107070237B CN 201710228080 A CN201710228080 A CN 201710228080A CN 107070237 B CN107070237 B CN 107070237B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33584—Bidirectional converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/38—Means for preventing simultaneous conduction of switches
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33515—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with digital control
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33592—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer having a synchronous rectifier circuit or a synchronous freewheeling circuit at the secondary side of an isolation transformer
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
- H02M1/0058—Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The invention discloses a converter circuit with bidirectional synchronous rectification and dead zone self-regulation, which comprises a V1 side circuit and a V2 side circuit which are bilaterally symmetrical, wherein the V1 side circuit comprises a MOS tube Q1, a MOS tube Q2, a MOS tube Q3 and a MOS tube Q4, and the V2 side circuit comprises a MOS tube Q5, a MOS tube Q6, a MOS tube Q7 and a MOS tube Q8. The invention has the beneficial effects that: 1. the invention provides a technology for realizing synchronous rectification under the condition of controlling bidirectional conversion in bidirectional DC/DC conversion, realizes bidirectional synchronous rectification aiming at LLC topology, solves the problem of reverse-filling prevention of synchronous rectification under DC/DC bidirectional conversion, well realizes self-regulation of dead time by using the bidirectional synchronous rectification technology, and solves the problem that ZVS (zero crossing voltage) can not be realized under the limit condition of LLC dead time control. The bidirectional synchronous rectification reverse filling prevention and dead zone regulation are realized, the efficiency and the reliability of the circuit are greatly improved, the LLC efficiency is optimized, and the EMC problem is also improved.
Description
Technical Field
The invention relates to a converter circuit, in particular to a converter circuit with bidirectional synchronous rectification and dead-zone self-regulation.
Background
As a DC/DC converter for realizing conversion of different direct-current voltages, a conventional DC/DC converter is generally a unidirectional conversion and a DC/DC conversion of a non-isolated BUCK-BOOST topology. The energy storage and the full utilization of energy are achieved. In the aspect of vehicle-mounted and battery formation, DC/DC bidirectional conversion is urgently needed, and a conventional non-isolated DC/DC converter has potential safety hazards due to the fact that the traditional non-isolated DC/DC converter is not provided with electrical isolation, so that the isolated DC/DC bidirectional converter becomes a main research object.
The LLC topology is the most preferred of the DC/DC converter, the LLC topology can realize ZVS in almost the whole range, the ZCS can be realized by a secondary rectifier tube with f < fr (resonant frequency), the control mode is PFM, and the EMC of the circuit can be improved as a natural frequency jitter mode. Fig. 1 shows a conventional full-bridge LLCDC/DC converter, which is a unidirectional diode rectification method.
As shown in fig. 2, the LLCDC/DC converter synchronous rectification is performed. Traditional diode rectification, under the low pressure heavy current output condition, the proportion that the conduction loss of diode accounts for is big for circuit efficiency is difficult to adjust, and the increase of loss has brought the heat dissipation degree of difficulty again, needs to increase corresponding heat dissipation measure, has increased the heat dissipation cost, and the modularization volume also is difficult to do for a short time, and has reduced the circuit reliability, has not realized the function of DC/DC bidirectional conversion simultaneously.
If the DC/DC converter adopts synchronous rectification, the conduction loss caused by a rectifying tube can be reduced, the circuit efficiency is improved, the heat dissipation cost is reduced, the circuit power density can be high, and the DC/DC bidirectional conversion function can be realized.
The LLCDC/DC converter synchronous rectification brings some problems such as current back-flow problem under f < fr and P < Po (rated power) conditions. The current back-sinking problem can cause Vds peak stress to occur when the secondary side tube is turned off and the turn-off loss of the secondary side increases, while coupling to the primary side causes the primary side to be fed back by the body diode current, and the reverse recovery of the body diode of the primary side tube can cause an instantaneous short circuit of the primary side, which can cause damage to the primary side tube. This greatly reduces circuit reliability and the anti-back-flow technique must be implemented. FIG. 2 is a schematic diagram of a general LLCDC/DC synchronous rectification.
The driving of the secondary sides Q5-Q8 is realized by detecting the voltage between Vds of corresponding tubes through a synchronous rectification IC, and controlling the driving of Q5-Q8 through voltage comparison between the Vds. The method can only realize unidirectional DC/DC conversion, cannot realize DC/DC bidirectional conversion, and cannot realize ZVS soft switching under high-voltage light load or low-voltage heavy load, which is related to the setting of dead time.
Dead time control is mostly adopted for traditional LLC-DC/DC conversion, but for LLC, under the conditions of low-voltage heavy load and high-voltage light load, the time difference of ZVS soft switching is large, the soft switching in a real full range cannot be met by only depending on the dead time, and meanwhile, the dead time influences the circuit efficiency to a certain extent.
As shown in fig. 3, the scheme is a synchronous rectification and dead-zone regulation scheme for the LLCDC/DC converter, and the dead-zone regulation scheme regulates the LLC circuit, so that ZVS is realized in the full range, and meanwhile, the synchronous rectification and reverse-filling prevention are realized. But the DSP algorithm is adopted to carry out dead zone regulation under the action of the secondary side output power and the switching frequency f.
The DC/DC converter can only realize the DC/DC one-way conversion function, and the dead zone is regulated by adopting the DSP control, so that the control complexity is increased, and particularly under the condition of carrying out two-way DC/DC conversion, the control is more complicated.
Disclosure of Invention
It is an object of the present invention to provide a converter circuit with bidirectional synchronous rectification and dead-time self-regulation to solve the problems set forth in the background above.
In order to achieve the purpose, the invention provides the following technical scheme:
a converter circuit with bidirectional synchronous rectification and dead zone self-regulation comprises a V-side circuit and a V-side circuit which are bilaterally symmetrical, wherein the V-side circuit comprises an MOS tube Q, an MOS tube Q and an MOS tube Q, the V-side circuit comprises the MOS tube Q, the MOS tube Q and the MOS tube Q, the drain electrode of the MOS tube Q is connected with the drain electrode, a capacitor Ca and a voltage V of the MOS tube Q, the source electrode of the MOS tube Q is connected with a capacitor Cr, the drain electrode of the MOS tube Q and a synchronous rectification IC, the source electrode of the MOS tube Q is connected with a winding LM of a transformer T, the drain electrode of the MOS tube Q and a synchronous rectification IC, the grid electrode of the MOS tube Q is connected with the grid electrode of the MOS tube Q and a driving signal Vg, the grid electrode of the MOS tube Q is connected with the drain electrode of the MOS tube Q, the cathode electrode of a diode D, the drain electrode of the MOS tube Q and the drain electrode of the diode D and the driving signal V, the grid of MOS tube Q is connected with capacitor C, resistor R and the source of triode Q, the base of triode Q is connected with the other input end of AND gate U and the output end of NOT gate F, the output end of AND gate U is connected with DSP, the anode of diode D is connected with the source of MOS tube Q and the output end of AND gate U, one input end of AND gate U is connected with NOT gate F, the other input end of AND gate U is connected with output signal Vg of DSP, the grid of MOS tube Q is connected with resistor R, the collector of triode Q and capacitor C, the base of triode Q is connected with output signal Fig of DSP, the drain of MOS tube Q is connected with the drain of MOS tube Q, capacitor Cb and voltage V, the source of MOS tube Q is connected with capacitor Cb, the source of MOS tube Q and synchronous rectification IC, the source of MOS tube Q is connected with transformer T, the drain of MOS tube Q and synchronous rectification IC, the grid of MOS tube Q is connected with the grid of, The drain of the MOS transistor Q13, the cathode of the diode D3, the drain of the MOS transistor Q11 and the driving signal Vg58, the gate of the MOS transistor Q6 is connected to the gate of the MOS transistor Q7 and the driving signal Vg67, the synchronous rectifier IC2 is further connected to the input terminal of the and gate U3, the anode of the diode D3 and the MOS transistor Q11, the gate of the MOS transistor Q11 is connected to the source of the transistor Q12, the base of the transistor Q12 is connected to the other input terminal of the and gate U3 and the output terminal of the not gate F3, the output terminal of the and gate U3 is connected to the DSP, the anode of the diode D3 is connected to the source of the MOS transistor Q3 and the output terminal of the and gate U3, one input terminal of the and gate U3 is connected to the not gate F3, the other input terminal of the and gate U3 is connected to the output signal Vg3 of the DSP, the gate of the transistor Q3 is.
As a still further scheme of the invention: the triode Q16, the triode Q17, the triode Q12 and the triode Q14 are all N-type triodes.
Compared with the prior art, the invention has the beneficial effects that: 1. the invention provides a technology for realizing synchronous rectification under the condition of controlling bidirectional conversion in bidirectional DC/DC conversion, realizes bidirectional synchronous rectification aiming at LLC topology, solves the problem of reverse-filling prevention of synchronous rectification under DC/DC bidirectional conversion, well realizes self-regulation of dead time by using the bidirectional synchronous rectification technology, and solves the problem that ZVS (zero crossing voltage) can not be realized under the limit condition of LLC dead time control. The bidirectional synchronous rectification reverse filling prevention and dead zone regulation are realized, the efficiency and the reliability of the circuit are greatly improved, the LLC efficiency is optimized, and the EMC problem is also improved. 2. Because when the input voltage is higher (if the circuit is not improved, the circuit is suitable for the occasion less than 200V), the synchronous rectification IC is influenced by the voltage, a high-voltage side is provided, the synchronous rectification is not carried out, the body diode is adopted for rectification, the logic control is added, the circuit is suitable for high-voltage and low-voltage conditions, and the control is simple and convenient to realize.
Drawings
Fig. 1 is a circuit diagram of prior art 1.
Fig. 2 is a circuit diagram of prior art 2.
Fig. 3 is a circuit diagram of prior art 3.
Fig. 4 is a circuit diagram of the present invention.
FIG. 5 is a circuit diagram of an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 4, in an embodiment of the present invention, the present invention provides a converter circuit with bidirectional synchronous rectification and dead zone self-regulation, including a V-side circuit and a V-side circuit that are bilaterally symmetric, where the V-side circuit includes a MOS transistor Q, and a MOS transistor Q, a drain of the MOS transistor Q is connected to a drain of the MOS transistor Q, a capacitor Ca, and a voltage V, a source of the MOS transistor Q is connected to a capacitor Cr, a drain of the MOS transistor Q, and a synchronous rectification IC, a source of the MOS transistor Q is connected to a winding LM of a transformer T, a drain of the MOS transistor Q, and a synchronous rectification IC, a gate of the MOS transistor Q is connected to a gate of the MOS transistor Q and a driving signal Vg, a gate of the MOS transistor Q is connected to a gate of the MOS transistor Q, a drain of the MOS transistor Q, a cathode of a diode D, a, The anode of the diode D and the MOS tube Q, the grid of the MOS tube Q is connected with the capacitor C, the resistor R and the source of the triode Q, the base of the triode Q is connected with the other input end of the AND gate U and the output end of the NOT gate F, the output end of the AND gate U is connected with the DSP, the anode of the diode D is connected with the source of the MOS tube Q and the output end of the AND gate U, one input end of the AND gate U is connected with the NOT gate F, the other input end of the AND gate U is connected with the output signal Vg of the DSP, the grid of the MOS tube Q is connected with the resistor R, the collector of the triode Q and the capacitor C, the base of the triode Q is connected with the output signal Fig of the DSP, the drain of the MOS tube Q is connected with the drain of the MOS tube Q, the capacitor Cb and the voltage V, the source of the MOS tube Q is connected with the capacitor Cb, the source of the MOS tube Q and, The diode D4 has a cathode, a drain of the MOS transistor Q13, a cathode of the diode D3, a drain of the MOS transistor Q11, and a driving signal Vg58, a gate of the MOS transistor Q6 is connected to a gate of the MOS transistor Q7 and the driving signal Vg67, the synchronous rectifier IC2 is further connected to an input terminal of the and gate U3, an anode of the diode D3 and the MOS transistor Q11, a gate of the MOS transistor Q11 is connected to a source of the transistor Q11, a base of the transistor Q11 is connected to the other input terminal of the and gate U11 and an output terminal of the not gate F11, an output terminal of the and gate U11 is connected to the DSP, an anode of the diode D11 is connected to a source of the MOS transistor Q11 and an output terminal of the and gate U11, an input terminal of the and gate U11 is connected to the not gate F11, another input terminal of the gate U11 is connected to the output signal Vg 11 of the DSP, a gate of the transistor Q11.
The transistor Q16, the transistor Q17, the transistor Q12 and the transistor Q14 are all N-type transistors.
The working principle of the invention is as follows: since the DC/DC bidirectional converter is used, one flag signal Fig1 is provided for both directions, and the flag signal Fig1 has different amplitudes in different directions of operation, for example, high and low levels.
If the circuit works at V1 → V2, Fig1 is 0; working at V2 → V1, Fig1 is 1; the synchronous rectification IC can adopt IR company or ON series, and the principle is that; vd is less than Vs, and high level is output; vd > Vs, output low. The Q3 and Q8 tubes are used as analysis objects, and the working principle of the Q4 and Q7 tubes is the same as that of Q3 and Q8.
1: working under the condition of V1 → V2, the DSP judges and gives the Fig1 as 0.
On the V1 side, Q16 is on, Q15 is off, Q17 is on, Q18 is off; the Vg14 and Vg23 drives are directly issued by the DSP. The Q3 tube detects Vd > Vs, Vg6 is low level, the Vg23 driving signal follows Vg5, and the Vg5 signal follows the Vg4 signal sent by the DSP.
Suppose that at a certain moment, Q1, Q4 are turned off, Q2 and Q3 drive does not come yet, current on the side of V1 freewheels, the current flows through body diodes of Q2 and Q3, a synchronous rectification IC detects that voltage Vd at two ends of Q3D-S is less than Vs, Vg6 is at a high level, Vg6 is turned on through a diode D1, Vg6 directly supplies Q2 through the diode D1, and Q3 is driven at a high level, so that tubes of Q2 and Q3 are turned on immediately after ZVS is realized. Vg6 and Fig1 NOT gate signals output high level to the DSP through the AND gate, the DSP catches the high level and immediately sends out a Vg4 signal, the Q2 and the Q3 tube drive, and the Vg4 signal sent out by the DSP can immediately take over the Vg6 signal in the period from the current flowing through the Q2 and the Q3 body diode to the current reaching zero.
On the side of V2, Q12 is turned off, Q11 is turned on, and the voltage Vs > Vd and Vg1 at the two ends of the D-S of the Q8 tube are detected to be high; q14 is turned on, Q13 is turned off, and Vg3 is low; the drive signal of Vg58 follows Vg 1.
2: working under the condition of V2 → V1, the DSP judges and gives Fig1 as 1.
On the V2 side, Q12 is on, Q11 is off, Q14 is off, Q13 is on; the Vg58 and Vg67 drives are directly issued by the DSP. The Q8 tube detects Vd > Vs, Vg1 is low level, the Vg58 driving signal follows Vg3, and the Vg3 signal follows the Vg2 signal sent by the DSP.
Suppose that at a certain moment, Q6, Q7 are turned off, Q5 and Q8 drive does not come yet, current on the side of V2 freewheels, the current flows through body diodes of Q5 and Q8, a synchronous rectification IC detects that voltage Vd at two ends of Q8D-S is less than Vs, Vg1 is at a high level, Vg1 is turned on through a diode D3, Vg1 directly supplies Q8 through the diode D3, and Q8 is driven at a high level, so that tubes of Q5 and Q8 are turned on immediately after ZVS is realized. Vg1 and FIG1 signals output high level to DSP through AND gate, DSP catches high level and sends out Vg2 signal immediately, Q5 and Q8 tube drive, and the Vg2 signal sent out by DSP can immediately take over the Vg1 signal in the period that current flows through Q5 and Q8 body diodes until the current reaches zero.
On the side of V1, Q16 is turned off, Q15 is turned on, and the voltage Vs > Vd and Vg6 at the two ends of the D-S of the Q3 tube are detected to be high; q18 is turned on, Q17 is turned off, and Vg5 is low; the drive signal of Vg23 follows Vg 6.
Under the working occasion that the low-voltage is less than 200V, the circuit control strategy of fig. 4 is implemented, the LLC is bidirectionally converted for DC/DC, the problem that the current flows backwards and the soft switching of the LLC cannot be realized under the control of a dead-stop region is solved, the ZVS soft switching in the full range can be realized by adopting the automatic adjustment dead region, and the circuit efficiency is improved. And DSP software is adopted to participate in signal control, so that the bidirectional working mode can be flexibly controlled.
Fig. 5 shows another embodiment of the present invention. Because the synchronous rectification IC is limited by the I/O voltage, in a high-voltage occasion, the synchronous rectification is not carried out on the high-voltage side, and a tube with short body diode reverse recovery time is selected, so that the efficiency is influenced, but the control is more simple and convenient. By detecting the voltage on the high-voltage side, the signal of the detected voltage and the flag signal Fig1 are logically converted so that OV is 0, Fig1 is 1, Q is 0, and Q is 1 in other states. The rest is partly the same as in the embodiment of fig. 4.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (2)
1. A converter circuit with bidirectional synchronous rectification and dead zone self-regulation comprises a V-side circuit and a V-side circuit which are bilaterally symmetrical, and is characterized in that the V-side circuit comprises an MOS tube Q, an MOS tube Q and an MOS tube Q, the V-side circuit comprises the MOS tube Q, the MOS tube Q and the MOS tube Q, the drain electrode of the MOS tube Q is connected with the drain electrode, the capacitor Ca and the voltage V of the MOS tube Q, the source electrode of the MOS tube Q is connected with a capacitor Cr, the drain electrode of the MOS tube Q and a synchronous rectification IC, the source electrode of the MOS tube Q is connected with a winding LM of a transformer T, the drain electrode of the MOS tube Q and the synchronous rectification IC, the grid electrode of the MOS tube Q is connected with the grid electrode of the MOS tube Q and a driving signal Vg, the grid electrode of the MOS tube Q is connected with the drain electrode of the MOS tube Q, the drain electrode of the diode Q, the cathode of the diode D, the drain electrode of the MOS, The anode of the diode D and the MOS tube Q, the grid of the MOS tube Q is connected with the capacitor C, the resistor R and the source of the triode Q, the base of the triode Q is connected with the other input end of the AND gate U and the output end of the NOT gate F, the output end of the AND gate U is connected with the DSP, the anode of the diode D is connected with the source of the MOS tube Q and the output end of the AND gate U, one input end of the AND gate U is connected with the NOT gate F, the other input end of the AND gate U is connected with the output signal Vg of the DSP, the grid of the MOS tube Q is connected with the resistor R, the collector of the triode Q and the capacitor C, the base of the triode Q is connected with the output signal Fig of the DSP, the drain of the MOS tube Q is connected with the drain of the MOS tube Q, the capacitor Cb and the voltage V, the source of the MOS tube Q is connected with the capacitor Cb, the source of the MOS tube Q and, The diode D4 has a cathode, a drain of the MOS transistor Q13, a cathode of the diode D3, a drain of the MOS transistor Q11, and a driving signal Vg58, a gate of the MOS transistor Q6 is connected to a gate of the MOS transistor Q7 and the driving signal Vg67, the synchronous rectifier IC2 is further connected to an input terminal of the and gate U3, an anode of the diode D3 and the MOS transistor Q11, a gate of the MOS transistor Q11 is connected to a source of the transistor Q11, a base of the transistor Q11 is connected to the other input terminal of the and gate U11 and an output terminal of the not gate F11, an output terminal of the and gate U11 is connected to the DSP, an anode of the diode D11 is connected to a source of the MOS transistor Q11 and an output terminal of the and gate U11, an input terminal of the and gate U11 is connected to the not gate F11, another input terminal of the gate U11 is connected to the output signal Vg 11 of the DSP, a gate of the transistor Q11.
2. The converter circuit with bidirectional synchronous rectification and dead-time self-regulation according to claim 1, wherein the transistor Q16, the transistor Q17, the transistor Q12, and the transistor Q14 are N-type transistors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710228080.XA CN107070237B (en) | 2017-04-10 | 2017-04-10 | Converter circuit with bidirectional synchronous rectification and dead-zone self-regulation |
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| CN102170240A (en) * | 2011-04-20 | 2011-08-31 | 浙江大学 | Hybrid drive full-bridge synchronous rectifier |
| CN102307019A (en) * | 2011-08-12 | 2012-01-04 | 浙江昱能光伏科技集成有限公司 | Quasi-resonant control circuit of inverter |
| CN102315698A (en) * | 2011-08-30 | 2012-01-11 | 杭州矽力杰半导体技术有限公司 | Magnetic field coupling-type non-contact electric energy transmission device |
| CN103326581A (en) * | 2013-06-24 | 2013-09-25 | 成都芯源系统有限公司 | LLC resonant converter, control circuit and driving method |
| CN104935063A (en) * | 2015-06-18 | 2015-09-23 | 电子科技大学 | Positive and negative pulse charging converter for storage battery |
| CN206992958U (en) * | 2017-04-10 | 2018-02-09 | 深圳市永联科技股份有限公司 | A kind of converter circuit being self-regulated with bi-directional synchronization rectification and dead band |
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| CN102170240A (en) * | 2011-04-20 | 2011-08-31 | 浙江大学 | Hybrid drive full-bridge synchronous rectifier |
| CN102307019A (en) * | 2011-08-12 | 2012-01-04 | 浙江昱能光伏科技集成有限公司 | Quasi-resonant control circuit of inverter |
| CN102315698A (en) * | 2011-08-30 | 2012-01-11 | 杭州矽力杰半导体技术有限公司 | Magnetic field coupling-type non-contact electric energy transmission device |
| CN103326581A (en) * | 2013-06-24 | 2013-09-25 | 成都芯源系统有限公司 | LLC resonant converter, control circuit and driving method |
| CN104935063A (en) * | 2015-06-18 | 2015-09-23 | 电子科技大学 | Positive and negative pulse charging converter for storage battery |
| CN206992958U (en) * | 2017-04-10 | 2018-02-09 | 深圳市永联科技股份有限公司 | A kind of converter circuit being self-regulated with bi-directional synchronization rectification and dead band |
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